Will let LSM answer, but in the meantime....
I would also help if you gave the specific NG variant, they do have different airfoils. (and winglets may have some effect on rate at 200 kts)
Many, many variables associated with roll rate. Altitude, AP engaged/not engaged, winds, aileron trim, fuel load, flap settings, LE, speed brakes, etc...
In the sim, noted a much different world, yoke loading, and far too much input required for elevator and aileron trim than the real ac...